slirpvde: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/slirpvde - from package: vde2

You may install the required package with command apt-get install {package}

Error in other languages:
slirpvde: bevel nie gevind nie
slirpvde: comandă negăsită
slirpvde: comando não encontrado
slirpvde: commande introuvable
slirpvde: command not found
slirpvde: käsku ei ole
slirpvde: không tìm thấy lệnh
slirpvde: komanda nerasta
slirpvde: Kommando nicht gefunden.
slirpvde: kommandot finns inte
slirpvde: komut yok
slirpvde: nie znaleziono polecenia
slirpvde: níor aimsíodh an t-ordú
slirpvde: no se encontró la orden
slirpvde: no s'ha trobat l'ordre
slirpvde: opdracht niet gevonden
slirpvde: parancs nem található
slirpvde: perintah tidak ditemukan
slirpvde: príkaz nenájdený
slirpvde: příkaz nenalezen
slirpvde: команда не найдена
slirpvde: командата не е открита
slirpvde: 命令找不到
slirpvde: コマンドが見つかりません